His wife told police she found her 65-year-old husband dead in his chair, and investigators said they found bullet holes in the rear window of the couple's home.

Neighbors said they saw a suspicious man walking in the neighborhood shortly before the shooting, and police issued a composite sketch Feb. 15 of the person of interest.

Officers received two tips, but they said neither person closely matched the sketch.

"We still would like to hear from someone who may know who this is," sad Chief R. Steven Bailey, of Miami Township police. That includes the person in the sketch. If you recognize yourself and have an innocent reason for being in the neighborhood, please contact us and help us clear this up."

Police also want to know about a white van that was parked in the neighborhood about the same time.

Witnesses said the van was either a Plymouth or Chevy Astrovan. It was white and boxy and had windows on the sides, witnesses said.

Police said they're considering several persons of interest, and a search warrant was executed Feb. 15 at a home near Bethel, but no arrests were made.

"We know that people would like to see this investigation resolved quickly, but we are dealing with the realities of long turnaround times for forensic testing," Bailey said. "It takes two to three weeks to get results from ballistics testing, 10 to 90 days for cell phone records, 30 days or more for DNA results, 30 to 180 days for results of the examination of electronic devices, and 13 weeks or longer for toxicology results."